If one box contains 10 grapefruits and there were 20,400 boxes in one season, then all we need to do is to multiply 20,400 by 10:
20,400 * 10 = 204,000
So the citrus grower shipped 204 thousand grapefruits.
204,000 boxes of grapefruit
The citrus grower shipped a total of 204,000 grapefruits by multiplying the number of boxes shipped (20,400) by the number of grapefruits per box (10).
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